论文标题
库仑耦合双moiré晶格中的激子密度波
Exciton density waves in Coulomb-coupled dual moiré lattices
论文作者
论文摘要
晶格中的强烈相关的玻色子是一个实现物质和量子相变的丰富效率状态的平台。虽然在冷原子实验中研究了晶格中的玻色子，但它们在固态系统中的实现仍然具有挑战性。在这里，我们捕获了由绑定的电子孔对组成的玻璃体 - 在由角度对准的WS2/BiLayer WSE2/WS2多层的晶格中；异质结构支持顶部和底部接口几乎相同时期的库仑耦合三角摩尔晶格。当两个晶格的组合电子填充因子（带任意分区）相关的绝缘状态相关，等于1/3,2/3,4/3和5/3。这些新状态可以解释为激子和孔的玻色纤维混合物中的激子密度波。由于成分之间存在强烈的排斥相互作用，因此孔形成坚固的广义晶体，将激子流体限制在自发打破晶格的翻译对称性的通道中。我们的结果表明，库仑耦合的moiré晶格是相关的多个玻色子现象的肥沃地面。
Strongly correlated bosons in a lattice are a platform to realize rich bosonic states of matter and quantum phase transitions. While strongly correlated bosons in a lattice have been studied in cold-atom experiments, their realization in a solid-state system has remained challenging. Here we trap interlayer excitons--bosons composed of bound electron-hole pairs--in a lattice provided by an angle-aligned WS2/bilayer WSe2/WS2 multilayer; the heterostructure supports Coulomb-coupled triangular moiré lattices of nearly identical period at the top and bottom interfaces. We observe correlated insulating states when the combined electron filling factor of the two lattices, with arbitrary partitions, equals to 1/3,2/3,4/3 and 5/3. These new states can be interpreted as exciton density waves in a Bose-Fermi mixture of excitons and holes. Because of the strong repulsive interactions between the constituents, the holes form robust generalized Wigner crystals , which restrict the exciton fluid to channels that spontaneously break the translational symmetry of the lattice. Our results demonstrate that Coulomb-coupled moiré lattices are fertile ground for correlated many-boson phenomena.
